Dump safety lock



FIG. 1 is a side perspective view of a dump safety lock showing my new design;

FIG. 2 is a left side view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a rear view thereof; and,

FIG. 7 is a front view thereof.

The broken lines in the figures show portions of the dump safety lock that form no part of the claimed design. 

CLAIM The ornamental design for a dump safety lock, as shown and described. 